Answer / reejusri

Its a computer architecture thing:

ISA stands for instruction set architecture. ISA determines
the computational characteristics of a computer. ISA deals
with the design of datatypes, register sets, and the
instruction set (including addressing modes) of the
computer.

HSA, hardware-system architecture, deals with computer's
major HW subsystems including CPU, memory and I/O. HSA
determines how efficiently the machine will operate.

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